Fly-trapping window screen



P. B. SAMUELSON.

FLY TRAPPING WINDOW SCREEN.

APPLICATION FILED AUG.25, 1920.

1,41 1, 1 89. Patented Mar. 28, 1922.

[NIKE/Y TOIP. 1 /704 .5 J/y/vws-Lso/v 5y ///5 flTTOMVEY UNITED STATES PAUL B. SAMUELSQN, OF MINNEAPOLIS, MINNESOTA.

FLY-TRAPPING wmnow SCREEN.

Specification of Letters Patent. Patented pl 28 1922 Application filed August 25, 1920. Serial No. 405,894.

To aZZ whom it may concern:

Be it known that I, PAUL B. SAMUELsoN, a citizen of the UnitedStates, residing at Minneapolis, in the county of Hennepin and State of Minnesota, have invented certain new and useful Improvements in Fly-Trapping Window Screens; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention has for its object to provide a simple and efiicient fly trapping window screen adapted to be set into a window opening below a raised sash; and to such ends. generally stated, the invention consists of the novel devices and combinations f devices hereinafter described and defined in the claims. I

The improved screen is iliustrated in the accompanying drawings wherein like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1 is a view in elevation showing the improved screen;

Fig. 2 is a horizontal section on the line 22 of Fig. 1;

Fig. 3 is a vertical section on the line 3--3 of Fig. 1;

Fig. 4 is an enlarged fragmentary section through the screen sheets on the line of Fig. 1; and

Fig. 5 is an enlarged fragmentary section through the screen sheets on. the line of Fig. l.

The trapping screen comprises two rcctain gnlar frames 6, preferably of the same size, and these frames, on the opposing faces of their upper and lower bars are provided with dove-tailed grooves 7, in which work the sliding double dove-tailed strips 8. Thus the frames 6 are slidably connected so that they may be extended to fit in openings of difl'erent widths. Each frame 6 is covered by two sheets 9 and 10 of woven wire screen. For the purpose of distinction the sheets 9 are designated as the main sheets, and the sheets 10 as the supplemental sheets. The sheets 9 and 10 which are attached at their margins to the same frame 6, are spaced laterally, so as to afl'ord a fly trapping chamber 11 between the two sheets. Each of the two sheets is paneled off by laterally pressed channels 12 that intersect at right angles, and, at the intersections of the horizontal and vertical channels 12, the two reticulate sheets are formed with laterally pressed nipples'lli that terminate in small passages '13 of the size to permit flies to pass therethrough without much clearance. The nipples 13' of both reticulate sheets open into the fly-trapping chamber 11 of the corresponding screen section.

One or the other of the reticulate sheets of each. screen section is provided with a fly discharge passage that is normally closed by a. gravity-held pivoted cover 14. Vvheii these discharge ports are open, live flies may be permitted to escape where they may be destroyed, or dead flies can be taken out.

lVith this fly trapping screen, it is evident that flies will be trapped, both from the outer and from the inner side of the screen. Flies alighting upon the outer or inner retic ulate sheets will run into the grooves 12 and will follow said grooves until they reach the nipples 13, when they will pass through the nipple-opening 13 into the trapping chambers 11. Flies once caught in the trapping chamber will not find their way out again through the nipple openings 13 and will be caged until destroyed.

The efficiency of this fly-trapping screen has been demonstrated in practice. It not only prevents flies from entering through the window opening, but traps flies that alight on the screen. In Fig. 2, some clearance is shown between the reticulate sheets 9 and the inner vertical bars of the frame 6, but in practice this clearance will be so slight that flies could not pass therethrough.

Of course, it will be understood that if it is desired totrap the flies only from one side of the screen, then one of the two sheets of screen cloth, towit: the one opposite the side from which the trapping is desired, might be flat and without the intersecting channels 12 or the nipples 13.

What I claim is:

1. A fly trapping screen having reticulate sheets spaced to afford a fly trapping chamber between them and provided with intersecting channels, and at the intersections of said channels with laterally pressed nipples that open into said fly trapping chamber.

2. A fly trapping screen comprising a rectangular frame and a pair of reticulate sheets secured thereto at its margin, said sheets being formed with laterally pressel vertical and horizontal channels, and at the intersections of said channels, having later- Ill) ally pressed nipples that open into said fly trapping chamber. v

3. A fly trapping screen comprising a pair of sliclably connected rectangular 'f'anies, and it'or each frame, apair of reticulate sheets secured thereto at their margins, said sheets having vertical and horizontal channels, and at the intersection oils-aid channels having laterally pressed nipples that open into the fly trapping chamber torined be tween said sheets, the sheets of the two frames being in reverse arrangement, so that flies Will be trapped, both from the inner and outer side of the screen.

between said sheets, the sheets being res versely arranged and the said nipples tending through the greater port on oi the distance between the sheets whereby the space between the sheets forms a fly trap chamber.

5. A fly trapping screen comprising two spaced screen sheets providing a fly trapping chamber between thennat least one of which is provided with channels in the surface thereof and with open ended nipples pressed laterally from said channels.

6. A screen cloth for fly trapping screens comprising a Woven Wire reticulate screen cloth having pressed, or otherwise formed therein, channels which intersect at right angles, and laterally projecting nipples at the intersection of these channels, said nipples having openings in the bottoms thereof.

7. A screen cloth for wire trapping screens comprising a WOVQIl Wire reticnlate screen cloth havingpressed, or otherwise formed therein, channels and spaced. nipples pro j ecting from the bottom of said channels and having openings in the bottom thereof.

In testimony whereof I a'liix my signature.

PAUL SAMUELSON. 

